This department features three projects that use pervasive computing technologies to monitor or assist patients. In the first project, the researchers are exploring technologies to enable patients to record their brain activity and head movement while sleeping, and to help automate drug-use supervision. The researchers in the second project are adding ultrasound-based distance ranging to the traditional walking stick that the visually impaired use. In the third project, the researchers used RFID tags to monitor patient behaviors and movement patterns and to limit their access in a hospital. This department is part of a special issue on implantable electronics.